Whole house water filter installs easily on 3/4" main water line to extend life of washing machines, water heaters and other household appliances. A half-turn of the patented shut-off valve in filter cap shuts off water supply for easy cartridge changes. Clear housing design for monitoring cartridge life. Accept a variety of Culligan sediment filter cartridges (not included). Tested and certified by NSF International under ANSI/NSF Standard 42. 5.25 x 13.25".